Silence the critics? They are very much vocal till date. Criticism is everyone's right and the critics are not above criticism, they should not be...
I have already seen in the previous threads that those murderers who are killing the writers, bloggers and publishers in Bangladesh on a regular basis share their radical ideology with most of the Bangladeshis in this forum, if this is the public opinion of most Bangladeshis in general, then maybe the state should start sanctioning such murders.
Speaking out against idol worship shouldn't be much of a problem considering that Hinduism is not a monolithic religion and even atheism is a part of the Hindu philosophy. The killing of M. M. Kalburgi was unfortunate, investigation is on and the killers will be caught. However, Hinduism is not the only religion he spoke against, and we are yet to know who killed him and why he was killed. And nothing justifies a murder, not even if Kalburgi talked about urinating on idols, or someone published a picture of prophet Muhammad, or wrote something criticizing any religion.